Remove explicit inheritance from object

Within the git module.

In Python 2, it was necessary to inherit from object to have a
new-style class. In Python 3, all classes are new-style classes,
and inheritance from object is implied.

Usually, removing explicit inheritance from object is only a small
clarity benefit while modernizing Python codebases. However, in
GitPython, the benefit is greater, because it is possible to
confuse object (the root of the Python class hierarchy) with
Object (the root of the GitPython subhierarchy of classes
representing things in the git object model).

Author: EliahKagan

Diff for: git/cmd.py

@@ -490,7 +490,7 @@ def check_unsafe_options(cls, options: List[str], unsafe_options: List[str]) ->
                         f"{unsafe_option} is not allowed, use `allow_unsafe_options=True` to allow it."
                     )
 
-    class AutoInterrupt(object):
+    class AutoInterrupt:
         """Process wrapper that terminates the wrapped process on finalization.
 
         This kills/interrupts the stored process instance once this instance goes out of
@@ -602,7 +602,7 @@ def read_all_from_possibly_closed_stream(stream: Union[IO[bytes], None]) -> byte
 
     # END auto interrupt
 
-    class CatFileContentStream(object):
+    class CatFileContentStream:
         """Object representing a sized read-only stream returning the contents of
         an object.
 

Diff for: git/diff.py

@@ -79,7 +79,7 @@ def decode_path(path: bytes, has_ab_prefix: bool = True) -> Optional[bytes]:
     return path
 
 
-class Diffable(object):
+class Diffable:
     """Common interface for all objects that can be diffed against another object of
     compatible type.
 
@@ -90,7 +90,7 @@ class Diffable(object):
 
     __slots__ = ()
 
-    class Index(object):
+    class Index:
         """Stand-in indicating you want to diff against the index."""
 
     def _process_diff_args(
@@ -252,7 +252,7 @@ def iter_change_type(self, change_type: Lit_change_type) -> Iterator[T_Diff]:
         # END for each diff
 
 
-class Diff(object):
+class Diff:
     """A Diff contains diff information between two Trees.
 
     It contains two sides a and b of the diff, members are prefixed with

Diff for: git/index/typ.py

@@ -32,7 +32,7 @@
 # } END invariants
 
 
-class BlobFilter(object):
+class BlobFilter:
     """
     Predicate to be used by iter_blobs allowing to filter only return blobs which
     match the given list of directories or files.

Diff for: git/index/util.py

@@ -33,7 +33,7 @@
 # } END aliases
 
 
-class TemporaryFileSwap(object):
+class TemporaryFileSwap:
     """Utility class moving a file to a temporary location within the same directory
     and moving it back on to where on object deletion."""
 

Diff for: git/objects/tree.py

@@ -102,7 +102,7 @@ def merge_sort(a: List[TreeCacheTup], cmp: Callable[[TreeCacheTup, TreeCacheTup]
         k = k + 1
 
 
-class TreeModifier(object):
+class TreeModifier:
     """A utility class providing methods to alter the underlying cache in a list-like fashion.
 
     Once all adjustments are complete, the _cache, which really is a reference to

Diff for: git/objects/util.py

@@ -337,7 +337,7 @@ def parse_actor_and_date(line: str) -> Tuple[Actor, int, int]:
 # { Classes
 
 
-class ProcessStreamAdapter(object):
+class ProcessStreamAdapter:
     """Class wiring all calls to the contained Process instance.
 
     Use this type to hide the underlying process to provide access only to a specified

Diff for: git/refs/symbolic.py

@@ -55,7 +55,7 @@ def _git_dir(repo: "Repo", path: Union[PathLike, None]) -> PathLike:
     return repo.common_dir
 
 
-class SymbolicReference(object):
+class SymbolicReference:
     """Special case of a reference that is symbolic.
 
     This does not point to a specific commit, but to another

Diff for: git/repo/base.py

@@ -108,7 +108,7 @@ class BlameEntry(NamedTuple):
     orig_linenos: range
 
 
-class Repo(object):
+class Repo:
     """Represents a git repository and allows you to query references,
     gather commit information, generate diffs, create and clone repositories query
     the log.

Diff for: git/util.py

@@ -516,7 +516,7 @@ def remove_password_if_present(cmdline: Sequence[str]) -> List[str]:
 # { Classes
 
 
-class RemoteProgress(object):
+class RemoteProgress:
     """
     Handler providing an interface to parse progress information emitted by git-push
     and git-fetch and to dispatch callbacks allowing subclasses to react to the progress.
@@ -723,7 +723,7 @@ def update(self, *args: Any, **kwargs: Any) -> None:
         self._callable(*args, **kwargs)
 
 
-class Actor(object):
+class Actor:
     """Actors hold information about a person acting on the repository. They
     can be committers and authors or anything with a name and an email as
     mentioned in the git log entries."""
@@ -847,7 +847,7 @@ def author(cls, config_reader: Union[None, "GitConfigParser", "SectionConstraint
         return cls._main_actor(cls.env_author_name, cls.env_author_email, config_reader)
 
 
-class Stats(object):
+class Stats:
     """
     Represents stat information as presented by git at the end of a merge. It is
     created from the output of a diff operation.
@@ -908,7 +908,7 @@ def _list_from_string(cls, repo: "Repo", text: str) -> "Stats":
         return Stats(hsh["total"], hsh["files"])
 
 
-class IndexFileSHA1Writer(object):
+class IndexFileSHA1Writer:
     """Wrapper around a file-like object that remembers the SHA1 of
     the data written to it. It will write a sha when the stream is closed
     or if the asked for explicitly using write_sha.
@@ -942,7 +942,7 @@ def tell(self) -> int:
         return self.f.tell()
 
 
-class LockFile(object):
+class LockFile:
     """Provides methods to obtain, check for, and release a file based lock which
     should be used to handle concurrent access to the same file.